Hope the devs see this thread then, going to add a tag.

Devs, please consider a 3 min cooldown for Issekigan. While 5 min isn't too horribly long, 3 minutes might provide a more dynamic play for most battles. 30 seconds is very brief especially when you look at how often you would potentially need to switch between Utsusemi Ichi and Ni. But if 3 minutes is tipping the game balance, I wouldn't mind settling for Utsusemi San in the near future.